Printing telegraph apparatus



May 1943" e AN 1 318, 026

PRINTING :TELEGRAPH APPARATUS 4- 7 Original Filed May 20, 1939 FIG. 1

' 2 Sheets-Sheet. l

CARL W. SWAN May 4, 1943. c. w. SWAN 2,318,026. PRINTING TELEGRAPHAPPARATUS V 2 Sheets-Sheet 2 W l. 4 2 if F 4 I I 33 O 6 3 l 4 3 i v o 3W 4 5 1 7 m M m m m 6 mil m .l

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Patented May 4, 1943 PRINTING TELEGRAPH APPARATUS Carl W. Swan, Chicago,Ill., assignor to Teletype Corporation, Chicago, lll., a corporation ofDelaware Original application May 20, 1939, Serial No.

274,811. Divided and this application July 5,

1940, Serial No. 344,099

4 Claims. (Cl. 19773) The present invention relates to printingtelegraph apparatus and more particularly to improvements in printingelements therefor.

This application is a division of application Serial No. 274,811, filedMay 20, 1939.

The primary object of the invention is to provide a printer platen whichis subjected to both automatic and manual control so that thepositionment of the platen may be alterable independently of theautomatic control.

A further feature resides in the provision of a dually controlledprinting platen whereby the platen is not only shiftable selectivelyunder the control of received signals to print upper and lower casecharacters, but is also shiftable manually, independently of the caseshift mechanism, to render the platen accessible and readilyinterchangeable.

A more complete understanding of the foregoing objects and features ofthe invention may be had from the following description when taken inconjunction with the accompanying drawings, wherein like referencecharacters indicate the same parts throughout, and wherein,

Fig. l is a perspective view of the apparatu embodying the presentinvention;

Fig. 2 is a sectional view of a keyboard perforator embracing certainfeatures of the invention;

Fig. 3 is a plan view of the apparatus shown in Fig. l, with certainparts broken away for clarity;

Fig. 4 is a sectional view taken substantially on line (-4 of Fig. 3;Fig. 5 is an enlarged sectional view of a portion of the punch block;

Fig. 6 is an enlarged plan view of the-die plate according to thepresent invention;

Fig. 7 is an enlarged plan view of a strip of printed tape perforated inaccordance with the method of the present invention;

Fig. 8 is an enlarged sectional view taken on.

line88ofFig.7;

Fig. 9 is a view of the selector magnet partially deleted from Fig. 3;

Fig. 10 is a view similar to Fig. 5 showing punch elements in operatedposition; and

Fig. 11 is an enlarged perspective view of a portion of the signalcontrol strip, produced according to the present invention, to show alidded aperture.

Since the disclosure herein set forth is inIthe,

. vor similar printer mechanisms operative to prop- I erly select thevarious type elements, move the P perforate a tape so as to providelidded apertures. The printed message corresponding to the perforatedrecord appears on said tape directly over the hinged lids and remainsfully'readable. The present invention, of course, is not limited to thetype of printer exemplified by the aforementioned patent, but anyprinter to which the invention is applicable is contemplated.

As disclosed in the above-mentioned patent,

the platen ll (Figs. 1, 3 and 4) over which the paper tape passes fromright to left is located in the front and central part, of theapparatus. However, the platen used in this invention is of differentconstruction, comprising as will hereinafter appear,-a cylindricalplunger carried in a rectangular block and shiftable in the manner setforth in said patent.

Arranged above the platen l I is the ribbon feed mechanism indicatedgenerally as I3, the left spool only of which is shown in Fig. 1. Theinking ribbon I5 is directed in well-known manner over platen l I fromone spool to the other; automatic ribbon reversing mechanism also beingprovided. Type bars l2 are positioned to the rear of the platen and arearranged for striking forwardly and downwardly. Just to the rear of thetype bars I! is a series of notched code bars it which in the presentinstance are substantially semicircular in shape. Actuating bars I foroperating the type bars l2 are located immediately in front of the codebars l6,v and are adapted to be pulled one at a time into the alignmentof notches in the code bars it when the notches are selectively alignedfor a particular character or function. As indicated in said patent, theactuating bars II are articulated to the type bars I 2 through a gearand rack means.

The selecting mechanism for selectively operating the code bars I6 is ofthe sword-and-T type, fully disclosed in said patent. Briefly, thisselector mechanism comprises a selecting or receiving electromagnet ll(Figs. 1, 3 and 9), the armature lever |8 of which comprises a selectingarm l9 having abutments 2| and 22 which cooperate with abutments 23 and24 of a. series 'of swords 25. The armature lever. I8 is responsiveunder certain conditions to the energization of the magnet H (forexample, upon receipt of marking or current impulses) and under otherconditions to'the pull of a spring 28 (for example, upon the receipt ofno current or spacing impulses), the tension of spring 26 being ad-Justable by means of screw 21. The swords 25, of which there is aplurality corresponding in number to the series of code bars l6, arebrought into operative engagement with the selector arm l9 by theirindividual operating levers 28 pivoted on a common pivot rod 29. Swords25 are pivotally articulated by a socket connection to their individuallevers 28. Each of the levers 28 is provided with an arm 3| and isnormally biased in a clockwise direction about the pivot 29 by a spring32. Arms 3| co-operate with a series of helically arranged projections33 on a selector cam drum 34, which is frictionally driven by a mainoperating shaft 35 located in a perpendicular position at the rear andto the right of the code bars I6. The main operating shaft is drivencontinuously by a motor 36 through a pinion 31, secured to the motorshaft 38, which pinion meshes with a gear (not shown) operativelyassociated with shaft 35.

As fully described in the aforementioned patent, the cam drum 34' isinitiated into rotation upon receipt of a starting impulse which causesthe de-energization of the magnet thereby releasing the armature leverl8 which then responds to the pull of spring 26 to rotate the lever |8in a clockwise direction. Upon this movement, an eccentric screw 4|(Fig. 9) co-operates with a plunger 42 which acts in the manner shown inFig. 5 of U. S. Patent No. 1,884,745 to release, through a leverarrangement, a stop arm (not shown) to initiate rotation of cam 34.

The speed of rotation of selector cam drum 34 is synchronized with thespeed of code impulsing so that as the armature lever H3 is operated inresponse to received impulses, a cam 33 acts upon ward positions inresponse to the impulses of a code signal.

As described in Patent 1,745,633, the setting of the code bars I6 ismaintained during the printing operation by a detent or locking means.Accordingly, a locking bar 49 is provided which cooperates with bevelednotches 5| on code bars l8. Bar 49 is pivotally mounted and is movedinto and out of engagement with the code bars I5 as the striker bar orprinting bail 52 is raised and lowered. The printing bail 52 is operatedby a printing cam (not shown) on the main shaft 35, in a mannerdescribed in Patent 1,745,633. When the printing bail-52 is in itslowermost position, it co-operates with the beveled edges 53 of the barsI4 and 49 to hold such bars out of engagement with the code bars I 6 sothat the code bars |6 may be readily shifted in accordance with theoperation of the selector mechanism. When the printing bail 52 isoperated upwardly to perform th printing operation, the bars l4 and 49,due to the beveled edge 53, are permitted gradually to be actuatedtoward the code bar |6 by their individual springs 54. The actuatingbars M are provided with a hook portion 55 which co-operates with theprinting bail 52, which in its upward movement engages said hook 55 tolift the actuating bar l4, which through the rack and pinion engagementwith the type bar causes the type bar to rotate about its pivot to bringthe type face downwardly to impinge upon the platen The locking bar 49is not provided with a hook portion 55. Its function is merely to rockon its pivot toward and away from the code bars l6 under the control ofthe printing bail 52 to lock the code bars its associated lever 28 torock it counterclockwise (as viewed in Fig. 3) to bring its sword 25against selector arm l9. Sword 2-5 will be swun clockwise orcounterclockwise, depending on whether abutments 2| and 23 or 22 and 24co operate; for example, if abutments 2| and 23 co-operate, then thesword 25 will be swung in a: counterclockwise direction and will assumethe position shown in Fig. 3. On the other hand, if abutments 22 and 24co-operate, then sword 25 will be swung in a clockwise direction toassume the opposite position. After the sword 25 has been set inaccordance with the nature of the signal impulse and the cam 33 passesout of operative engagement with arm 3|, the lever 28 will be actuatedin a clockwise direction by its spring 32, carrying its associated sword25 along with it to impinge the sword 25 against arm 43 or 44 of aT-lever 45 pivoted at 46, thus rocking the T-lever 45 in a clockwise orcounterclockwise direction. Each of the T-levers 45 is pivotallyarticulated to a code bar I6 so that when a T-lever 45 is actuated in aclockwise or counterclockwise direction, its associated code bar isactuated leftwardly or rightwardly, respectively, on studs 41 and 48.Accordingly, with the selecting mechanism just described, the code barsl6 are set selectively in their rightward or left- Hi in their setposition during the printing operation.

According to the present invention the locking bar 49, while held in itsposition away from the code bars l5 when the printing bail '52 is in itslowermost position, co-operates with a series of bell cranks 56 (Fig. 3)to'hold said bell cranks in counterclockwiseposition. Bell cranks 56 areprovided with shouldered portions 51 through the instrumentality ofwhich the bell cranks 56 are permitted or prevented by code bars Hi fromrotating to their clockwise position. That is, if any one of the codebars I6 is set in the position indicated in Fig. 3, and the locking bar49 is permitted to enter the V notch, the bell crank 58 associatedtherewith is blocked through the impingement of shoulder 51 upon the endof the associated code bar |6. On the other hand, if a code bar l6assumes its leftward position, the bell crank 56 associated therewithwould not be blocked, but would rotate clockwise in response to springtension hereinafter indicated and follow the movement of the locking bar49. As viewed in Fig. 1, it is observed that there is provided a bellcrank 56 for each of the code bars l8. Co-operating with each of thebell cranks 56 is a vertical lever 58 pivoted on a common stud 59. Theupper end of each of the levers 58 cooperates with an arm of itsassociated bell crank 56. The lower ends of levers '58 co-operate with acorresponding series of bell cranks 6| pivotally carried on a commonshaft 62. Levers 58 and GI are pivotally mounted on a bracket 63 securedto base plate 64. The series of hell crank levers 8| co-operates with acorresponding series of bell crank levers 65, pivotally supported on apivot stud 86 secured to the bracket 63. The bell crank levers arenormally urged in a clockwise direction by individual springs 61. Thesprings.

61 associated with the bell crank levers 65 also serve to impart,through their co-operative relationship, rotational movement to levers6I, 58, and 56. The depending arms of bell crank levers 65 are providedwith enlarged portions which fit into corresponding notches in a seriesof interponents 68 (Fig. 4), whereby the bell crank levers 65 arepivotally articulated to the interponents 68. Interponents 68 areslidably arranged in a cradle 69 pivoted at II to the bracket 63 and areprovided near the left-hand upper edge with a cutaway portion I2 adaptedto clear associated punches I3 when said interponents are in a certainoperative position. Interponents 68 termi- -nate at the left endsthereof with an enlarged portion I4 whereby they are adapted toco-operate with the punches I3 when the interponents 68 are operated totheir rightward position, as viewed in Fig. 4. Cradle 69 is providedwith a projection "I adapted to cooperate with a feed hole punch (notshown) to invariably perforate a tape feed hole in the tape I24 for eachopera tion of the perforating mechanism. When the bell crank levers 56are held in their counterclockwise position shown in Fig. 3, theinterponents 68 assume their rightward or marking position. Conversely,when the bell crank levers 56 assume their clockwise position,interponents 68 assume their leftward or spacing position, as shown inFig. 4.

Cradle 69 is provided with an arm I5 projecting upwardly, to theextremity of which is pivotally connected an extensible link indicatedgenerally as I6; one end of link 16 being pivoted at 11 to arm I5 andthe other end of link I6 being pivotally connected at I0 to a perforatoroperating lever I9. In the present form of the invention, the link I6comprises one part 8I piv oted at I! to arm I5 and a part 82 pivoted atI8 to the operating lever I9. Parts Ill and 82 are slidably connectedand adjustably mounted on clamp screws 83 and 84 disposed in slots 85and 86 in part 82. Portion 82 of link I6 is provided with a pair ofspaced lugs 81 and 88, the portion 8| being provided with a single lug89 adapted to be positioned between lug 01 and 88.

In this manner, the length of link I6 may be readily adjusted byloosening the clamp screws 83 and 84 and inserting ascrewdriver orsimilar instrument between lugs 81 and 89 or 88 and 89, depending uponwhether link I6 is to be lengthened or shortened, and twisting saidinstrument until the proper length is attained, whereafter the clampscrews are tightened.

The operating lever I9 is pivotally mounted on a pivot rod 9I supportedin arms 92 and 93 of bracket 63. As viewed in Fig. 3, the operatinglever I9 is provided withan extension 94, at the extremity of which ismounted a cam follower roller 95 which co-operates with the perforatoroperating cam 96 carried on the main operating shaft 35. A spring 90acts upon lever I9 to hold cam roller 95 against the periphery of cam96.

Supported in the bracket 63 is a punch block indicated generally as 91in which is carried a series of punch elements I3. Each of the punchesI3 is provided with an enlarged section IN, the upper edge of whichco-operates with a stripper member I02 and the lower edge of whichcooperates with a backstop plate I03. Stripper member -I02 is urgeddownwardly by springs I04, to thereby hold the punches I3 in their lowerpositions free of the die plate I05. As shown in the enlarged sectionalview, Fig. 5, the punch I3 is shown fitted into a guide plate 98 withits 3 upper face disposed slightly below the upper surface of said guideplate. Disposed above the guide plate 98 is the die plate I05, shown inplan view in Fig. 6. The die plate I 05 is so sheared along edge I06 asto remove a portion of the metal surrounding each of the holes I 01 andI00: holes I01 being representative of the code punch holes and hole I08representing the feed punch hole. When the die plate I05 is arrangedabove the die plate 98, as shown in Fig. 5, the punches I3, whenoperated upwardly into co-operation with the die plate I 05 (asindicated in Fig. 10)

will cut away only a portion of the tape material, leaving a small hingeportion I I0 at the left side of the punch uncut (as viewed in Fig. 7),thus forcing the partially perforated lid, formed by each punch,upwardly into the die plate holes. During the punching operation, aslight tearing or shearing occurs at the point I20 (Figs. 7 and 11) ofthe hinge IIO (Fig. 10), as well as a very slight stretching of the tapematerial. To eject the hinged lid thus formed from the die plate I05, astripper member I09 is provided to co-operate with each punch I3.Strippers or ejectors I09 are arranged to be guided at their lower endsby the die plate I05 and at their upper ends by a Z shaped bracket IIIattached to the plate [05, and a compression spring H2 is provided foreach ejector I09 to urge the ejectors I09 downwardly. The ejectors I 09when in their downward position are adapted to extend slightly below thedie plates I05 so as to insure the ejection of the hinged lid producedin the material or tape worked upon. After ejection in this manner thehinged lids are slightly in relief, as a result of which the uppersurface of the tape may be readily determined.

It is understood, that the resultant position of thelid I25 with respectto the strip I24 is dependent upon the properties of the material ofwhich the strip is composed, as well as the thickness thereof. Forexample, in a paper strip, the lids I25 take the form or positionsubstantially as shown in Fig. 11, due to the inherent characteristicsof the paper, such a thinness and resilience. As the quality of thematerial worked upon tends toward softness, the lids I25 assume aposition in relief, substantially as shown in Fig. 8, wherein the planeof the lid I25 would tend toward parallelism with the plane of the bodyof the material or strip I24.

The tape, after being partially perforated in this manner, passes over atape feed roller II3 which is provided with a series of spaced feed pinsor projections II4 adapted to co-operate with the lidded feed holespunch and die plate. The feed roll I I3 is provided with a series oftoothed grooves II5 which co-operate with a tape feed pawl I I6pivotally carried on the cradle 69 in well-known manner. Fixed to theshaft to which the feed roller H3 is secured is a star wheel II'I (Fig.l) which co-operates with a detent member I I8, pivoted at II9 to thebracket 63, having a spring I2I which urges the detent roller intoengagement with the star wheel I". Fixed to the star wheel II! is athumb portion I22, whereby the feed roller II5 may be rotated manuallyeither clockwis or counterclockwise. Therefore, to perform a backspacingoperation, the thumb portion I22 is rotated clockwise so as to move thetape rightwardly, as viewed in Fig. 5. In order that the perforated tapemay be readily moved rightward- 1y for a backspacing operation, each ofthe ejector members I09 is provided with a wing portion formed by thefeedv I23 having an inclined lower edge, so that as the tape is movedrightwardly, any of the hinged lids which may be projecting upwardly atan angle will be cammed downwardly by the wing portion I23 so as toclear the die plate I95.

In Figs. 7, 8, and 11 is illustrated a portion of the tape printedand/or perforated in accordance with the present invention. The tape I24is perforated in such a manner that the lids I25 are not completelysevered but are hinged or attached at their left sides to the tapematerial so that when the tape is introduced into a tape transmitter,the sensing pins will force the lids I25 upwardly and the pins willprotrude through the opening provided therefor. As shown in Fig. 7, theprinting appears directly over the hinged lids as if the tape had notbeen perforated and is readily legible. In the specific embodiment ofthe invention herein shown, the perforated code combination is six stepsin advance of the corresponding printed character. That is, the codecombination represented by the transverse row I26, Fig. 7, correspondsto the letter Q in the word Quic Of course, it is understood that if awider tape is provided, the characters printed can be printed adjacentto the transverse row of code combinations of perforations correspondingthereto. It is conceivable that a tape having prepunched feed holeswould be desirable under certain conditions. In this event, the feedhole I56 (Fig. 7) would be indicated as fully perforated instead ofbeing provided with a hinged lid.

As indicated in Fig, 1 each type bar I2 is provided with two type faces,thus necessitating a case shift mechanism, which comprises means forshifting the platen II. As shown in Fig. 4 the platen II is illustratedas consisting of a cylinder capped with a hard rubber (or othersuitable) printing surface. Platen I I is removably held in a block 99slidably mounted on a shaft I66 which, in turn, is slidably supported inbrackets 63 and I21. Fixed to shaft III is acollar I26 against which theblock 99 is held by a spring I28 surrounding said shaft and compressedbetween block 99 and a shift arm I29 also fixed to said shaft. Block 99is slidable rearwardly on shaft Ill, through the instrumentality of anarm I34 fixed thereto, against the action of spring I26, to bring theplaten II from beneath the tape and inking ribbon, so that said platenthereby becomes accessible for ready removability andinterchangeability. The platen II is also shiftable under the control ofreceived code signals through the medium of shift actuating bar "4 andunshift actuating bar I15. Platen II is shown in Fig. 3 in its unshiftor letters position. To shift the platen II to figures position, theactuating bar.

' I14 is selected, which when picked up by the bail 62 is raised to rocklever I16 about its pivot III to lower its end I16 to eifect thedisengagement thereof from shift arm I29, whereupon spring I19compressed between bracket I21 and arm I29 causes shaft I69 to be movedforwardly until collar I26 thereon strikes against bracket 63. Since therelation between shift arm I29 and block 99 is unchanged, due to thecompressive action of spring I23, block 99 is shifted with the shaftIIII to bring platen II into the shift or figures position. To returnplaten II to the letters or unshift position (shown in Fig. 3) theactuating bar I is selected, which when raised by bail 52 rocks leverI6l about pivot I62, and in turn rocks member I63 about its pivot I64 toactuate shift arm I29 rearwardly until arm I29 is again latched by endI16 of lever I16. It is manifest that platen II is shiftable under twooperating conditions, one selectively in response to received codesignals to shift or unshift position, and the other manually through theinstrumentality of arm I29 to render the platen II accessible andinterchangeable.

General operation In the operation of the apparatus according to thepresent invention. the motor 36 is considered to be runningcontinuously, and thus rotates the main operating shaft 35. Carried onthe main operating shaft 35 are sleeve members rotatably associatedtherewith through clutch members as disclosed in Patent 1,745,633, whichsleeves are normall held against rotation. The selector magnet I1 isnormally energized so that upon the receipt of a start impulse ofspacing nature, the magnet II is de-energized and its armature lever I8is released under the tension of spring 26 whereby the stud 4I thereonurges the plunger 42 leftwardly to release through a series of levers-(not shown) the sleevemembers on the shaft 45 for rotation in timedrelation to each other. As indicated in the Patent 1,745,633, the camdrum selector 34 is released for rotation so that the cam projections 33thereon operate levers 28 in such a manner that through the cooperationof selector arm I9 therewith the swords 25 are caused to abut said armI9 and are actuated to one or the other of their selective positions.The operative relationship of the abutments on the swords 45 andselector lever I9 is determinative of the positions of said swords tooperate the T-levers 45 to one or the other of their operativepositions, the T-levers in turn actuating the code bars I6 to theirrightward or leftward position in accordance with the received codecombination.

In timed relation with the rotation of cam drum 34, the sleeve carryingthe printing cam (not shown) and the perforator operating cam 96 isinitiated into rotation. The printing cam operates through mechanism,not here shown but described and shown in said Patent 1,745,633 toreciprocate the printing ball 52 which, on its upward movement, permitsthe actuating bars I4 to respond to the pull of their individual springsto be urged into engagement with the code bars I6, one of theseactuating bars finding an alignment of slots or notches in the code barsI6 and thus traveling or rotating farther so as to bring its hookportion 55 into the path of the ball 52, so that the bail 52 in itsupward movement, picks up the hook portion 55 and raises the selectedactuating bar to effect rotation of the type bar I2 associated therewiththrough its rack and pinion connection. The type pallet on the type barI2 is therefore caused to impinge upon the platen II to print acharacter on the tape interposed therebetween.

Simultaneously with the actuation of the type bar for printing 'acharacter through the operation of the actuating bar I4 by printing ball62, the locking bar 49 is permitted to respond to the pull of its spring54 so that the upper edge of the locking bar 49 moves into the V notches5| in the code bars I6. In so doing, the levers 56 are permitted tofollow this movement of the looking bar 49 in response to the action ofspring 61 (Fig. 1). However, when any one of the code bars I6 is in itsrightward position, the shoulder 61 of lever 56 will strike against saidcode bar and the corresponding bell crank lever 56 will be blockedagainst movement. Therefore, the levers 53, bell crank levers 6| and 65,and interponents 88 associated therewith will have no motion or movementimparted thereto and will assume the position opposite to that shown inFig. 4, that is, with the portion 14 of interponent 68 in register withthe punch 13. However, when any one of the code bars I6 is in itsleftward position, the shoulder 51 of lever 56 will not be blocked byits associated code bar I6 and will be permitted to rotate in aclockwise direction under the action of spring 61 through theinterconnected levers 65, 6|, and 58. This movement will cause theinterponent 68 (Fig. 4) associated therewith to be actuated leftwardlyto bring the portion 14 of the interponent 68 out of register or alignement with the punch 13. .In proper timed relation with these operations,the cam 96 for operating the perforator will actuate the perforatinglever 19 clockwise, as viewed in Fig. 4, so that, through the link 16,the cradle 69 will be rocked clockwise to bring all of the interponents68, which have not been moved, into engagement with their respectivepunches 13, thus urging said .punches upwardly through the tape. As thecradle 69 is permitted to rock backward to its counterclockwiseposition, the stripper plate I04 acts to withdraw the punches 13, andthe ejectors I99 act to expel the hinged lids from the die plate I05.Thus, there is produced withthe present invention a printed andperforated tape, as shown in Fig. 7., g

Modification The present invention is applicable to a keyboardperforator such as is indicated in Fig. 2. The keyboard perforatingdevice illustratedls of the type shown in U. S. Patent 1,965,572, and

Fig. 2 corresponds to Fig. 4 of said patent. Al-

chanically operated type shown in Fig. 1. For a fuller understanding ofthe arrangement shown in Fig. 2, reference may be had to said Patent1,965,572.

multaneously more than one key lever, the key levers can only bedepressed part way when they will be blocked by the high portions of thecode bars I38. Connected-to the depending portions of each of the rockerarms or T-levers I39 is a longitudinally movable permutation bar I44.

The perforator disclosed in Fig. 2 comprises a punch block,constructed'as shown in Figs. 4 and 5. The distiguishing feature betweenthe punch mechanism, shown in Fig. 2 and that shown in the embodiment ofthe invention disclosed in Fig. 1 is that in the former the punchmechanism is magnetically operated. The punches I (Fig. 2) areselectively operatedby an actuating member or hammer I46 through theinstrumentality of interponents I41. Operatively associated with each ofthe punch interponents I41 is a pivoted member I48 which is connected tothe permutation bars I44 by means of'a link I49. Thus, upon the permutedsetting of the permutation bars I44, the punch interponents I41 will beset correspondingly through the movement of the link I49 and the pivotedarm I48 associated therewith.

.The hammer I46 rocks about its pivot and, forms the armature of anelectromagnet I5I.'

The interponents I41 are moved back and forth along the face of thehammer I 46, and, depending upon their selected position, the associatedpunch I 45 will be operated. In addition to the several pairs of codebars I38, there is provided an additional bar (not shown) which isoperated by the key levers I31 invariably, to cause through itsassociated permutation bar I44, link I49 and a lever I48, the closure ofa contact I52, which is connected in the operating circuit for theelectromagnet I5I. Upon each setting of the permutation bars I44, theelectromagnet I5I is energized, and the punch hammer I46 will be rockedclockwise to form a transverse row of perforations in thetape I53corresponding to the permuted setting of the punch interponents I41.

Briefly, the keyboard apparatus as shown in Fig. 2 comprises a housingI3I with which is associated a perforator mechanism indicated generallyas I32, and a transmitter mechanism indicated generally as I33.Supported in said housing on bearings I34 and I35 is a key lever pivotrod I36, on which are pivotally supported at their rear extremities keylevers I 31, which at their forward ends are provided with keytops I40,as indicated in Fig. 1. Arranged below the key levers I31 and disposedtransversely thereof are a plurality of pairs of code bars I 38. Eachpair of code bars I38 is supported at each end on a T-shaped lever I39.Each horizontal arm of the T-lever I39 is provided with a lug II, thelugs ll of each T-lever I39 being oppositely directed so that each lugI4I supports a code bar of each pair. T-levers I39 are rockable aboutpivots I42. The bars of each pair of code bars I38 are complemen tary;that, is to say, each bar is coded oppositely to its companion so thatthe high portions of one bar are opposite the low portions I 43 of itsAlso, for each operation of the punch hammer I46 and the punches I45, arow of feed holes, adapted to be engaged by the pin teeth of a feedwheel I54, is perforated in the tape. The feed wheel I54 is mounted on ashaft to which there is also secured a ratchet wheel I55 which isadapted to be engaged by the pawl I56 secured to v the end of the punchhammer I 46. The spring I51 secured to the pawl I56 serves to restorethe pawl and the hammer I46 to their normal or unactuated position uponthe de-energization of the electromagnet I5I When the electromagnet I 5|is energized in response to the closure of contact I52 connected in itsenergizing circuit, the pawl I56 will be moved vertically against thetension of spring I51 to cause its Operating portion to engage the nextsucceeding tooth of, the

companion bar. The connection between the code bars I38 of each pair issuch that the simulratchet wheel I55. Upon the de-energization of theelectromagnet I5I,'the spring I51 is effective to cause the pawl I56 tomove downwardly and thus effect the rotation of the ratchet wheel I55,and the corresponding rotation of the feed wheel. I54 to advance thetape I53 to bring an unperforated area thereof in alignment with thepunches I45.

The form of the invention in either Fig. 1 or Fig. 2 may have associatedtherewitha transmitting mechanism I33, in which event the permutationbars' I44 are each provided with a forked member I53 (Fig. 2).-Articulated tofl member I58 is a depending arm of alocking latch I59pivoted ona common shaft IIiI. .In thismanner, locking latches I59 arearticulated to thepermutation bars I44 and are adapted to be rockedabout pivot shaft I6I to either of two positions. Associated withlatches I59 is a corresponding series of contact levers I62 for makingand breaking individual contacts I63. Contact levers I62 co-operate withindividual contact cams on cam drum I64 mounted on the transmittingshaft I65, which is provided with a clutch M depression of a key lever I31 moves the bars I39 permutably in accordance with a predetermined codecombination, the setting of which, through permutation bars I44,determines the positions of the locking latches I59. The rotation of camdrum I64 is initiated substantially simultaneously with the setting ofthe locking latches I59 through the instrumentality of trip member I61which releases the clutch I66 for rotation, and a locking loop I12,controlled by a cam I13 carried on the cam assembly I64, is permitted torotate in counterclockwise direction (Figs. 1 and 2) to lock the latchesI59 in their selected positions. The setting of latches I59 determineswhether the contact levers I62 shall or shall not respond to theirassociated cams on cam drums I64 to transmit, through contact I63, overa signal line to the receiving station, a predetermined code combinationof signaling impulses. Incidentally, as is the usual practice, thereceiving magnet I! (Fig. I) is included in the line circuit so that theprinter of the home receiver will operate in response to the transmittedsignals. The respective notches in the cams on cam drum I64 are.

arranged in a helical progression so that upon the rotation of the camassembly I64, the contacts I63 controlled by levers I62 will be operatedsuccessively. The apparatus herein disclosed is operated in accordancewith an equal length letter code, fir which each code combination is apermutation of marking and spacing conditions and is preceded by a startimpulse and followed by a stop impulse according to the familiarstartstop system.

Although the present invention has been shown and described inconnection with certain specific embodiments thereof, it is of courseunderstood that such disclosure is merely illustrative and notrestrictive, reference being had to the appended claims to determine thescope of the invention, and all variations coming within the range ofequivalency of the appended claims are deemed to be embraced within thepurview of the appended claims- What is claimed is:

1. In a recorder, a recording mechanism comprising a set of recordinginstrumentalities, a shift shaft. a platen carrier normally operablewithin a restricted zone subjacent certain of said instrumentalities, aplaten removably inserted in said carrier, said platen normally renderedinaccessible by said certain of said instrumentalities, means foryieldably retaining said carrier on said shaft for operation in saidzone, case shift mechanism for altering the positionment of said carrierwithin said zone, and means to render said carrier movable manually fromits restricted zone of operationagainst the action of said retainingmeans independently of said case shift mechanism to facilitate theaccessibility of said platen. I

2. In a recorder, recording mechanism comprising a. set of recordinginstrumentalities, a shift shaft, 9. platen carrier slidably mounted onsaid shaft and normally operative in unison therewith within apredetermined zone of effectiveness subjacent certain of saidinstrumentalities, a platen removably inserted in said carrier, saidplaten normally rendered inaccessible by said certain of saidinstrumentalities, case shift mechanism for altering, through saidshaft, the positionment of said carrier within said zone. and means tofacilitate the positionment of said carrier outside said zoneindependently of said case shift mechanism to render said platenaccessible.

3. In a recorder, a recording mechanism comprising a set of recordinginstrumentalities, a spring-loaded shift shaft, a spring-loaded platencarrier mounted on said shaft and normally movable therewith within arestricted zone subiacent certain of said instrumentalities, a platenremovably inserted in said carrier, said platen normally renderedinaccessible by said certain of said instrumentalities, case shiftmechanism effective to load said shift shaft, and means operative toposition said carrier outside said restricted zone independently of saidcase shift mechanism to facilitate the accessibility of said platen.

4. In a recorder, a recording mechanism comprising a set of recordinginstrumentalities, a spring-loaded shift shaft, case shift mechanismeffective to load and release said shaft for case shift operations, aspring-loaded platen carrier mounted on said shaft and normally movabletherewith'within a restricted zone subjacent certain of saidinstrumentalities, a platen removably inserted in said carrier, saidplaten normally rendered inaccessible by said certain of saidinstrumentalities, and means operative to position said carrier outsidesaid restricted zone independently of said case shift mechanism tofacilitate the accessibility of said platen.

CARL W. SWAN.

